Lace curtain and shanty Irish
Lace curtain Irish and shanty Irish are terms that were commonly used in the 19th and 20th centuries to categorize Irish Americans, by social class. The "lace curtain Irish" were those who were well-off, while the "shanty Irish" were the poor, who were presumed to live in shanties, or roughly built cabins.
Source: Wikipedia — Lace curtain and shanty Irish (CC BY-SA 4.0)